mfd: mp2629: Add support for mps battery charger

mp2629 is a highly-integrated switching-mode battery charge management
device for single-cell Li-ion or Li-polymer battery.

Add MFD core enables chip access for ADC driver for battery readings,
and a power supply battery-charger driver

Signed-off-by: Saravanan Sekar <sravanhome@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index 0a59249198d34fa5cd87f00a32a333e0b938318f..3526a03855bea07010052553d2c4afa4ef55c38a 100644 (file)
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -434,6 +434,15 @@ config MFD_MC13XXX_I2C
        help
          Select this if your MC13xxx is connected via an I2C bus.
 
+config MFD_MP2629
+       tristate "Monolithic Power Systems MP2629 ADC and Battery charger"
+       depends on I2C
+       select REGMAP_I2C
+       help
+         Select this option to enable support for Monolithic Power Systems
+         battery charger. This provides ADC, thermal and battery charger power
+         management functions.
+
 config MFD_MXS_LRADC
        tristate "Freescale i.MX23/i.MX28 LRADC"
        depends on ARCH_MXS || COMPILE_TEST

diff --git a/drivers/mfd/Makefile b/drivers/mfd/Makefile
index f935d10cbf0fccccc1033de2e15a0c074410d618..d6c210f96d020a34d04068d021d27a389876debb 100644 (file)
--- a/drivers/mfd/Makefile
+++ b/drivers/mfd/Makefile
@@ -170,6 +170,8 @@ obj-$(CONFIG_MFD_MAX8925)   += max8925.o
 obj-$(CONFIG_MFD_MAX8997)      += max8997.o max8997-irq.o
 obj-$(CONFIG_MFD_MAX8998)      += max8998.o max8998-irq.o
 
+obj-$(CONFIG_MFD_MP2629)       += mp2629.o
+
 pcf50633-objs                  := pcf50633-core.o pcf50633-irq.o
 obj-$(CONFIG_MFD_PCF50633)     += pcf50633.o
 obj-$(CONFIG_PCF50633_ADC)     += pcf50633-adc.o

diff --git a/drivers/mfd/mp2629.c b/drivers/mfd/mp2629.c
new file mode 100644 (file)
index 0000000..16840ec
--- /dev/null
+++ b/drivers/mfd/mp2629.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * MP2629 parent driver for ADC and battery charger
+ *
+ * Copyright 2020 Monolithic Power Systems, Inc
+ *
+ * Author: Saravanan Sekar <sravanhome@gmail.com>
+ */
+
+#include <linux/i2c.h>
+#include <linux/kernel.h>
+#include <linux/mfd/core.h>
+#include <linux/mfd/mp2629.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/regmap.h>
+#include <linux/slab.h>
+
+static const struct mfd_cell mp2629_cell[] = {
+       {
+               .name = "mp2629_adc",
+               .of_compatible = "mps,mp2629_adc",
+       },
+       {
+               .name = "mp2629_charger",
+               .of_compatible = "mps,mp2629_charger",
+       }
+};
+
+static const struct regmap_config mp2629_regmap_config = {
+       .reg_bits = 8,
+       .val_bits = 8,
+       .max_register = 0x17,
+};
+
+static int mp2629_probe(struct i2c_client *client)
+{
+       struct mp2629_data *ddata;
+       int ret;
+
+       ddata = devm_kzalloc(&client->dev, sizeof(*ddata), GFP_KERNEL);
+       if (!ddata)
+               return -ENOMEM;
+
+       ddata->dev = &client->dev;
+       i2c_set_clientdata(client, ddata);
+
+       ddata->regmap = devm_regmap_init_i2c(client, &mp2629_regmap_config);
+       if (IS_ERR(ddata->regmap)) {
+               dev_err(ddata->dev, "Failed to allocate regmap\n");
+               return PTR_ERR(ddata->regmap);
+       }
+
+       ret = devm_mfd_add_devices(ddata->dev, PLATFORM_DEVID_AUTO, mp2629_cell,
+                                  ARRAY_SIZE(mp2629_cell), NULL, 0, NULL);
+       if (ret)
+               dev_err(ddata->dev, "Failed to register sub-devices %d\n", ret);
+
+       return ret;
+}
+
+static const struct of_device_id mp2629_of_match[] = {
+       { .compatible = "mps,mp2629"},
+       { }
+};
+MODULE_DEVICE_TABLE(of, mp2629_of_match);
+
+static struct i2c_driver mp2629_driver = {
+       .driver = {
+               .name = "mp2629",
+               .of_match_table = mp2629_of_match,
+       },
+       .probe_new      = mp2629_probe,
+};
+module_i2c_driver(mp2629_driver);
+
+MODULE_AUTHOR("Saravanan Sekar <sravanhome@gmail.com>");
+MODULE_DESCRIPTION("MP2629 Battery charger parent driver");
+MODULE_LICENSE("GPL");

diff --git a/include/linux/mfd/mp2629.h b/include/linux/mfd/mp2629.h
new file mode 100644 (file)
index 0000000..baaeeaf
--- /dev/null
+++ b/include/linux/mfd/mp2629.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+/*
+ * Copyright 2020 Monolithic Power Systems, Inc
+ */
+
+#ifndef __MP2629_H__
+#define __MP2629_H__
+
+#include <linux/device.h>
+#include <linux/regmap.h>
+
+struct mp2629_data {
+       struct device *dev;
+       struct regmap *regmap;
+};
+
+#endif